package com.hefei.hight;

/**
 * @author caizhengjun
 * @date 2020/9/4 8:44 下午
 */
public class Test02 {
    public static void main(String[] args) {
        String str = null;

        StringBuffer sb = new StringBuffer();
        sb.append(str);

        System.out.println(sb.length());

        System.out.println(sb);

        StringBuffer sb1 = new StringBuffer(str);

        System.out.println(sb1);
    }
}
